My 335 brakes started making that squeaking sound a couple months ago, it happens after the brakes are warmed up and travelling at a lower speed. As Iím sure many have explained before on the post, itís due to the brake dust build up on the brake sensors. I was planning on upgrading my brakes this coming summer with some slotted and drilled rotors and some new pads and sensors, and since most of my driving to and from work now is pretty short distance, the brakes rarely get warm enough to make the sound. But occasionally I make longer trips and the squeaking is getting louder and is EMBARASSING!

Do you guys think itís wise to upgrade the brakes sooner during the winter timeÖ or should I just stick it out and wait till spring?

Doesn't really matter what time of year you change out your brakes. If in the winter, make sure you have some dry roads to properly bed in the brakes pads. I would just stick with the slotted rotors, drilled have the potential of cracking and are obsolet with the newer brake pads, they are for aesthetic purposes only (and saving 0.2 lbs).

My 335 brakes started making that squeaking sound a couple months ago, it happens after the brakes are warmed up and travelling at a lower speed. As Iím sure many have explained before on the post, itís due to the brake dust build up on the brake sensors. I was planning on upgrading my brakes this coming summer with some slotted and drilled rotors and some new pads and sensors, and since most of my driving to and from work now is pretty short distance, the brakes rarely get warm enough to make the sound. But occasionally I make longer trips and the squeaking is getting louder and is EMBARASSING!

Do you guys think itís wise to upgrade the brakes sooner during the winter timeÖ or should I just stick it out and wait till spring?

A simple recommendation. Pull out the sensors from the pads, it's very easy, just for 1 day and see if the squealing goes away. The sensors are ONE of a few reasons our brakes squeal.

I will try pulling out the sensors and getting the brakes warm to see if they squeal. what could be the other reasons if not the sensors?

Brake squeel is caused by vibration between the rotors, pads, and calipers. Most of the noise, in my experience, is caused from the calipers clips which hold the pads in place. You can apply some CNC anti-squeel on the back of the pads to see if this helps. You could also have a poor contact between the pads an the rotors, turning the rotors might alleviate the noise. Finally, sometimes the surface of the pads becomes uneven and might need to be sanded down with fine grit sand paper. Due to the material of our brake pads, this is just something you, and every other owner, is going to have to deal with. I found the OEM pads make less noise then the "low dust" pads.

Doesn't really matter what time of year you change out your brakes. If in the winter, make sure you have some dry roads to properly bed in the brakes pads. I would just stick with the slotted rotors, drilled have the potential of cracking and are obsolet with the newer brake pads, they are for aesthetic purposes only (and saving 0.2 lbs).

If your pads are fine then waiting to change your set up will not cause any issues. As stated I would start by checking the brake sensor, it may be causing the sound you are hearing. If that's not the issues and your pads are getting near the end of their life I wouldn't wait to long to replace the pads.

For your new pads and rotors if slotted and drilled is what you are desiring I have a great kit found HERE using our ECS Slotted and Drilled rotors, EBC RedStuff Brake pads, and new wear sensors. If you'd prefer just a slotted set up I also have a kit with our ECS Slotted rotors instead of the Slotted and Drilled rotors which can be found HERE.

i have about 37000 miles left on the front brakes and 12000 miles left on the rear (at least thats what shows up on my service info), so the pads themselves have a lot of life left in them, I plan to take the car to the track this summer so a brake upgrade was on my mind anyway. The only decision is to either do it now or in spring.

This may be a stupid question, but if it is the brake dust build up on the sensor causing the noise, couldnt i just use some brake cleaner to get rid of the problem for now?

No, but make sure you pop open the brake fluid reservior cap to let the pressure out. Use a C-clamp to squeeze the caliper so you can remove them from the rotor (this part can be tricky). If just doing pads, there is a DIY on how to swap pads out without removing the entire caliper.